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A group 2 metal, M, is reacted with water so that M + 2H2O --> M(OH)2 + H2. 0.162g of metal produces 97.0cm3 of gas at RTP. Identify M.

1 mole of gas is produces for 1 mole of metal used. n (moles) = volume/24000 ---- This is because 1 mole of a gas occupies 24000cm3 of space, so it's a simple ratio to work out moles(H2). = 97/24000 = 0.0040...
CS
Answered by Cory S. • Chemistry tutor
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Explain why the first ionisation energy of strontium is less than the first ionisation energy of calcium

Both of these are alkali-earth elements, this means that both elements have the same amount of outer-shell electrons (2 electrons). Strontium is a row below calcium, meaning it has an additional electron she...
CS
Answered by Cory S. • Chemistry tutor
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1) Gluconeogenesis 2) Glycogenesis 3) Glycolysis. Which is stimulated by glucagon production? [A] 1, 2, 3 [B]1 [C] 2, 3 [D] 1,2

B is the answer. Glucagon stimulates an increase in blood sugar/ [glucose] Gluco means glucose is the product Glyco means glycogen (storage of glucose in animals) is the product Neo means substrate is from a...
JM
Answered by James M. • Biology tutor
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How many people died during Mao's Great Leap Forward?

Mao's Great Leap Forward 'killed 45 million in four years'
IW
Answered by Isabella W. • History tutor
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What three factors make up the criteria of a biodiversity hotspot?

Species richness, endemism and level of threat
IW
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